Prairie Ochre vs Terre Verte Hue

How close are they?

ΔE 21.1, loose: different enough that you should pick on purpose. Terre Verte Hue is noticeably lighter, cooler than Prairie Ochre.

Can I use Terre Verte Hue instead of Prairie Ochre?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Terre Verte Hue is noticeably lighter, cooler than Prairie Ochre.

Can I use Prairie Ochre instead of Terre Verte Hue?

The same difference applies the other way round: Prairie Ochre is noticeably darker, warmer.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.